| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dx.cf.code; |
| |
| import com.android.dx.util.Hex; |
| |
| /** |
| * Constants and utility methods for dealing with bytecode arrays at an |
| * opcode level. |
| */ |
| public class ByteOps { |
| // one constant per opcode |
| public static final int NOP = 0x00; |
| public static final int ACONST_NULL = 0x01; |
| public static final int ICONST_M1 = 0x02; |
| public static final int ICONST_0 = 0x03; |
| public static final int ICONST_1 = 0x04; |
| public static final int ICONST_2 = 0x05; |
| public static final int ICONST_3 = 0x06; |
| public static final int ICONST_4 = 0x07; |
| public static final int ICONST_5 = 0x08; |
| public static final int LCONST_0 = 0x09; |
| public static final int LCONST_1 = 0x0a; |
| public static final int FCONST_0 = 0x0b; |
| public static final int FCONST_1 = 0x0c; |
| public static final int FCONST_2 = 0x0d; |
| public static final int DCONST_0 = 0x0e; |
| public static final int DCONST_1 = 0x0f; |
| public static final int BIPUSH = 0x10; |
| public static final int SIPUSH = 0x11; |
| public static final int LDC = 0x12; |
| public static final int LDC_W = 0x13; |
| public static final int LDC2_W = 0x14; |
| public static final int ILOAD = 0x15; |
| public static final int LLOAD = 0x16; |
| public static final int FLOAD = 0x17; |
| public static final int DLOAD = 0x18; |
| public static final int ALOAD = 0x19; |
| public static final int ILOAD_0 = 0x1a; |
| public static final int ILOAD_1 = 0x1b; |
| public static final int ILOAD_2 = 0x1c; |
| public static final int ILOAD_3 = 0x1d; |
| public static final int LLOAD_0 = 0x1e; |
| public static final int LLOAD_1 = 0x1f; |
| public static final int LLOAD_2 = 0x20; |
| public static final int LLOAD_3 = 0x21; |
| public static final int FLOAD_0 = 0x22; |
| public static final int FLOAD_1 = 0x23; |
| public static final int FLOAD_2 = 0x24; |
| public static final int FLOAD_3 = 0x25; |
| public static final int DLOAD_0 = 0x26; |
| public static final int DLOAD_1 = 0x27; |
| public static final int DLOAD_2 = 0x28; |
| public static final int DLOAD_3 = 0x29; |
| public static final int ALOAD_0 = 0x2a; |
| public static final int ALOAD_1 = 0x2b; |
| public static final int ALOAD_2 = 0x2c; |
| public static final int ALOAD_3 = 0x2d; |
| public static final int IALOAD = 0x2e; |
| public static final int LALOAD = 0x2f; |
| public static final int FALOAD = 0x30; |
| public static final int DALOAD = 0x31; |
| public static final int AALOAD = 0x32; |
| public static final int BALOAD = 0x33; |
| public static final int CALOAD = 0x34; |
| public static final int SALOAD = 0x35; |
| public static final int ISTORE = 0x36; |
| public static final int LSTORE = 0x37; |
| public static final int FSTORE = 0x38; |
| public static final int DSTORE = 0x39; |
| public static final int ASTORE = 0x3a; |
| public static final int ISTORE_0 = 0x3b; |
| public static final int ISTORE_1 = 0x3c; |
| public static final int ISTORE_2 = 0x3d; |
| public static final int ISTORE_3 = 0x3e; |
| public static final int LSTORE_0 = 0x3f; |
| public static final int LSTORE_1 = 0x40; |
| public static final int LSTORE_2 = 0x41; |
| public static final int LSTORE_3 = 0x42; |
| public static final int FSTORE_0 = 0x43; |
| public static final int FSTORE_1 = 0x44; |
| public static final int FSTORE_2 = 0x45; |
| public static final int FSTORE_3 = 0x46; |
| public static final int DSTORE_0 = 0x47; |
| public static final int DSTORE_1 = 0x48; |
| public static final int DSTORE_2 = 0x49; |
| public static final int DSTORE_3 = 0x4a; |
| public static final int ASTORE_0 = 0x4b; |
| public static final int ASTORE_1 = 0x4c; |
| public static final int ASTORE_2 = 0x4d; |
| public static final int ASTORE_3 = 0x4e; |
| public static final int IASTORE = 0x4f; |
| public static final int LASTORE = 0x50; |
| public static final int FASTORE = 0x51; |
| public static final int DASTORE = 0x52; |
| public static final int AASTORE = 0x53; |
| public static final int BASTORE = 0x54; |
| public static final int CASTORE = 0x55; |
| public static final int SASTORE = 0x56; |
| public static final int POP = 0x57; |
| public static final int POP2 = 0x58; |
| public static final int DUP = 0x59; |
| public static final int DUP_X1 = 0x5a; |
| public static final int DUP_X2 = 0x5b; |
| public static final int DUP2 = 0x5c; |
| public static final int DUP2_X1 = 0x5d; |
| public static final int DUP2_X2 = 0x5e; |
| public static final int SWAP = 0x5f; |
| public static final int IADD = 0x60; |
| public static final int LADD = 0x61; |
| public static final int FADD = 0x62; |
| public static final int DADD = 0x63; |
| public static final int ISUB = 0x64; |
| public static final int LSUB = 0x65; |
| public static final int FSUB = 0x66; |
| public static final int DSUB = 0x67; |
| public static final int IMUL = 0x68; |
| public static final int LMUL = 0x69; |
| public static final int FMUL = 0x6a; |
| public static final int DMUL = 0x6b; |
| public static final int IDIV = 0x6c; |
| public static final int LDIV = 0x6d; |
| public static final int FDIV = 0x6e; |
| public static final int DDIV = 0x6f; |
| public static final int IREM = 0x70; |
| public static final int LREM = 0x71; |
| public static final int FREM = 0x72; |
| public static final int DREM = 0x73; |
| public static final int INEG = 0x74; |
| public static final int LNEG = 0x75; |
| public static final int FNEG = 0x76; |
| public static final int DNEG = 0x77; |
| public static final int ISHL = 0x78; |
| public static final int LSHL = 0x79; |
| public static final int ISHR = 0x7a; |
| public static final int LSHR = 0x7b; |
| public static final int IUSHR = 0x7c; |
| public static final int LUSHR = 0x7d; |
| public static final int IAND = 0x7e; |
| public static final int LAND = 0x7f; |
| public static final int IOR = 0x80; |
| public static final int LOR = 0x81; |
| public static final int IXOR = 0x82; |
| public static final int LXOR = 0x83; |
| public static final int IINC = 0x84; |
| public static final int I2L = 0x85; |
| public static final int I2F = 0x86; |
| public static final int I2D = 0x87; |
| public static final int L2I = 0x88; |
| public static final int L2F = 0x89; |
| public static final int L2D = 0x8a; |
| public static final int F2I = 0x8b; |
| public static final int F2L = 0x8c; |
| public static final int F2D = 0x8d; |
| public static final int D2I = 0x8e; |
| public static final int D2L = 0x8f; |
| public static final int D2F = 0x90; |
| public static final int I2B = 0x91; |
| public static final int I2C = 0x92; |
| public static final int I2S = 0x93; |
| public static final int LCMP = 0x94; |
| public static final int FCMPL = 0x95; |
| public static final int FCMPG = 0x96; |
| public static final int DCMPL = 0x97; |
| public static final int DCMPG = 0x98; |
| public static final int IFEQ = 0x99; |
| public static final int IFNE = 0x9a; |
| public static final int IFLT = 0x9b; |
| public static final int IFGE = 0x9c; |
| public static final int IFGT = 0x9d; |
| public static final int IFLE = 0x9e; |
| public static final int IF_ICMPEQ = 0x9f; |
| public static final int IF_ICMPNE = 0xa0; |
| public static final int IF_ICMPLT = 0xa1; |
| public static final int IF_ICMPGE = 0xa2; |
| public static final int IF_ICMPGT = 0xa3; |
| public static final int IF_ICMPLE = 0xa4; |
| public static final int IF_ACMPEQ = 0xa5; |
| public static final int IF_ACMPNE = 0xa6; |
| public static final int GOTO = 0xa7; |
| public static final int JSR = 0xa8; |
| public static final int RET = 0xa9; |
| public static final int TABLESWITCH = 0xaa; |
| public static final int LOOKUPSWITCH = 0xab; |
| public static final int IRETURN = 0xac; |
| public static final int LRETURN = 0xad; |
| public static final int FRETURN = 0xae; |
| public static final int DRETURN = 0xaf; |
| public static final int ARETURN = 0xb0; |
| public static final int RETURN = 0xb1; |
| public static final int GETSTATIC = 0xb2; |
| public static final int PUTSTATIC = 0xb3; |
| public static final int GETFIELD = 0xb4; |
| public static final int PUTFIELD = 0xb5; |
| public static final int INVOKEVIRTUAL = 0xb6; |
| public static final int INVOKESPECIAL = 0xb7; |
| public static final int INVOKESTATIC = 0xb8; |
| public static final int INVOKEINTERFACE = 0xb9; |
| public static final int NEW = 0xbb; |
| public static final int NEWARRAY = 0xbc; |
| public static final int ANEWARRAY = 0xbd; |
| public static final int ARRAYLENGTH = 0xbe; |
| public static final int ATHROW = 0xbf; |
| public static final int CHECKCAST = 0xc0; |
| public static final int INSTANCEOF = 0xc1; |
| public static final int MONITORENTER = 0xc2; |
| public static final int MONITOREXIT = 0xc3; |
| public static final int WIDE = 0xc4; |
| public static final int MULTIANEWARRAY = 0xc5; |
| public static final int IFNULL = 0xc6; |
| public static final int IFNONNULL = 0xc7; |
| public static final int GOTO_W = 0xc8; |
| public static final int JSR_W = 0xc9; |
| |
| // a constant for each valid argument to "newarray" |
| |
| public static final int NEWARRAY_BOOLEAN = 4; |
| public static final int NEWARRAY_CHAR = 5; |
| public static final int NEWARRAY_FLOAT = 6; |
| public static final int NEWARRAY_DOUBLE = 7; |
| public static final int NEWARRAY_BYTE = 8; |
| public static final int NEWARRAY_SHORT = 9; |
| public static final int NEWARRAY_INT = 10; |
| public static final int NEWARRAY_LONG = 11; |
| |
| // a constant for each possible instruction format |
| |
| /** invalid */ |
| public static final int FMT_INVALID = 0; |
| |
| /** "-": {@code op} */ |
| public static final int FMT_NO_ARGS = 1; |
| |
| /** "0": {@code op}; implies {@code max_locals >= 1} */ |
| public static final int FMT_NO_ARGS_LOCALS_1 = 2; |
| |
| /** "1": {@code op}; implies {@code max_locals >= 2} */ |
| public static final int FMT_NO_ARGS_LOCALS_2 = 3; |
| |
| /** "2": {@code op}; implies {@code max_locals >= 3} */ |
| public static final int FMT_NO_ARGS_LOCALS_3 = 4; |
| |
| /** "3": {@code op}; implies {@code max_locals >= 4} */ |
| public static final int FMT_NO_ARGS_LOCALS_4 = 5; |
| |
| /** "4": {@code op}; implies {@code max_locals >= 5} */ |
| public static final int FMT_NO_ARGS_LOCALS_5 = 6; |
| |
| /** "b": {@code op target target} */ |
| public static final int FMT_BRANCH = 7; |
| |
| /** "c": {@code op target target target target} */ |
| public static final int FMT_WIDE_BRANCH = 8; |
| |
| /** "p": {@code op #cpi #cpi}; constant restricted as specified */ |
| public static final int FMT_CPI = 9; |
| |
| /** |
| * "l": {@code op local}; category-1 local; implies |
| * {@code max_locals} is at least two more than the given |
| * local number |
| */ |
| public static final int FMT_LOCAL_1 = 10; |
| |
| /** |
| * "m": {@code op local}; category-2 local; implies |
| * {@code max_locals} is at least two more than the given |
| * local number |
| */ |
| public static final int FMT_LOCAL_2 = 11; |
| |
| /** |
| * "y": {@code op #byte} ({@code bipush} and |
| * {@code newarray}) |
| */ |
| public static final int FMT_LITERAL_BYTE = 12; |
| |
| /** "I": {@code invokeinterface cpi cpi count 0} */ |
| public static final int FMT_INVOKEINTERFACE = 13; |
| |
| /** "L": {@code ldc #cpi}; constant restricted as specified */ |
| public static final int FMT_LDC = 14; |
| |
| /** "S": {@code sipush #byte #byte} */ |
| public static final int FMT_SIPUSH = 15; |
| |
| /** "T": {@code tableswitch ...} */ |
| public static final int FMT_TABLESWITCH = 16; |
| |
| /** "U": {@code lookupswitch ...} */ |
| public static final int FMT_LOOKUPSWITCH = 17; |
| |
| /** "M": {@code multianewarray cpi cpi dims} */ |
| public static final int FMT_MULTIANEWARRAY = 18; |
| |
| /** "W": {@code wide ...} */ |
| public static final int FMT_WIDE = 19; |
| |
| /** mask for the bits representing the opcode format */ |
| public static final int FMT_MASK = 0x1f; |
| |
| /** "I": flag bit for valid cp type for {@code Integer} */ |
| public static final int CPOK_Integer = 0x20; |
| |
| /** "F": flag bit for valid cp type for {@code Float} */ |
| public static final int CPOK_Float = 0x40; |
| |
| /** "J": flag bit for valid cp type for {@code Long} */ |
| public static final int CPOK_Long = 0x80; |
| |
| /** "D": flag bit for valid cp type for {@code Double} */ |
| public static final int CPOK_Double = 0x100; |
| |
| /** "c": flag bit for valid cp type for {@code Class} */ |
| public static final int CPOK_Class = 0x200; |
| |
| /** "s": flag bit for valid cp type for {@code String} */ |
| public static final int CPOK_String = 0x400; |
| |
| /** "f": flag bit for valid cp type for {@code Fieldref} */ |
| public static final int CPOK_Fieldref = 0x800; |
| |
| /** "m": flag bit for valid cp type for {@code Methodref} */ |
| public static final int CPOK_Methodref = 0x1000; |
| |
| /** "i": flag bit for valid cp type for {@code InterfaceMethodref} */ |
| public static final int CPOK_InterfaceMethodref = 0x2000; |
| |
| /** |
| * {@code non-null;} map from opcodes to format or'ed with allowed constant |
| * pool types |
| */ |
| private static final int[] OPCODE_INFO = new int[256]; |
| |
| /** {@code non-null;} map from opcodes to their names */ |
| private static final String[] OPCODE_NAMES = new String[256]; |
| |
| /** {@code non-null;} bigass string describing all the opcodes */ |
| private static final String OPCODE_DETAILS = |
| "00 - nop;" + |
| "01 - aconst_null;" + |
| "02 - iconst_m1;" + |
| "03 - iconst_0;" + |
| "04 - iconst_1;" + |
| "05 - iconst_2;" + |
| "06 - iconst_3;" + |
| "07 - iconst_4;" + |
| "08 - iconst_5;" + |
| "09 - lconst_0;" + |
| "0a - lconst_1;" + |
| "0b - fconst_0;" + |
| "0c - fconst_1;" + |
| "0d - fconst_2;" + |
| "0e - dconst_0;" + |
| "0f - dconst_1;" + |
| "10 y bipush;" + |
| "11 S sipush;" + |
| "12 L:IFcs ldc;" + |
| "13 p:IFcs ldc_w;" + |
| "14 p:DJ ldc2_w;" + |
| "15 l iload;" + |
| "16 m lload;" + |
| "17 l fload;" + |
| "18 m dload;" + |
| "19 l aload;" + |
| "1a 0 iload_0;" + |
| "1b 1 iload_1;" + |
| "1c 2 iload_2;" + |
| "1d 3 iload_3;" + |
| "1e 1 lload_0;" + |
| "1f 2 lload_1;" + |
| "20 3 lload_2;" + |
| "21 4 lload_3;" + |
| "22 0 fload_0;" + |
| "23 1 fload_1;" + |
| "24 2 fload_2;" + |
| "25 3 fload_3;" + |
| "26 1 dload_0;" + |
| "27 2 dload_1;" + |
| "28 3 dload_2;" + |
| "29 4 dload_3;" + |
| "2a 0 aload_0;" + |
| "2b 1 aload_1;" + |
| "2c 2 aload_2;" + |
| "2d 3 aload_3;" + |
| "2e - iaload;" + |
| "2f - laload;" + |
| "30 - faload;" + |
| "31 - daload;" + |
| "32 - aaload;" + |
| "33 - baload;" + |
| "34 - caload;" + |
| "35 - saload;" + |
| "36 - istore;" + |
| "37 - lstore;" + |
| "38 - fstore;" + |
| "39 - dstore;" + |
| "3a - astore;" + |
| "3b 0 istore_0;" + |
| "3c 1 istore_1;" + |
| "3d 2 istore_2;" + |
| "3e 3 istore_3;" + |
| "3f 1 lstore_0;" + |
| "40 2 lstore_1;" + |
| "41 3 lstore_2;" + |
| "42 4 lstore_3;" + |
| "43 0 fstore_0;" + |
| "44 1 fstore_1;" + |
| "45 2 fstore_2;" + |
| "46 3 fstore_3;" + |
| "47 1 dstore_0;" + |
| "48 2 dstore_1;" + |
| "49 3 dstore_2;" + |
| "4a 4 dstore_3;" + |
| "4b 0 astore_0;" + |
| "4c 1 astore_1;" + |
| "4d 2 astore_2;" + |
| "4e 3 astore_3;" + |
| "4f - iastore;" + |
| "50 - lastore;" + |
| "51 - fastore;" + |
| "52 - dastore;" + |
| "53 - aastore;" + |
| "54 - bastore;" + |
| "55 - castore;" + |
| "56 - sastore;" + |
| "57 - pop;" + |
| "58 - pop2;" + |
| "59 - dup;" + |
| "5a - dup_x1;" + |
| "5b - dup_x2;" + |
| "5c - dup2;" + |
| "5d - dup2_x1;" + |
| "5e - dup2_x2;" + |
| "5f - swap;" + |
| "60 - iadd;" + |
| "61 - ladd;" + |
| "62 - fadd;" + |
| "63 - dadd;" + |
| "64 - isub;" + |
| "65 - lsub;" + |
| "66 - fsub;" + |
| "67 - dsub;" + |
| "68 - imul;" + |
| "69 - lmul;" + |
| "6a - fmul;" + |
| "6b - dmul;" + |
| "6c - idiv;" + |
| "6d - ldiv;" + |
| "6e - fdiv;" + |
| "6f - ddiv;" + |
| "70 - irem;" + |
| "71 - lrem;" + |
| "72 - frem;" + |
| "73 - drem;" + |
| "74 - ineg;" + |
| "75 - lneg;" + |
| "76 - fneg;" + |
| "77 - dneg;" + |
| "78 - ishl;" + |
| "79 - lshl;" + |
| "7a - ishr;" + |
| "7b - lshr;" + |
| "7c - iushr;" + |
| "7d - lushr;" + |
| "7e - iand;" + |
| "7f - land;" + |
| "80 - ior;" + |
| "81 - lor;" + |
| "82 - ixor;" + |
| "83 - lxor;" + |
| "84 l iinc;" + |
| "85 - i2l;" + |
| "86 - i2f;" + |
| "87 - i2d;" + |
| "88 - l2i;" + |
| "89 - l2f;" + |
| "8a - l2d;" + |
| "8b - f2i;" + |
| "8c - f2l;" + |
| "8d - f2d;" + |
| "8e - d2i;" + |
| "8f - d2l;" + |
| "90 - d2f;" + |
| "91 - i2b;" + |
| "92 - i2c;" + |
| "93 - i2s;" + |
| "94 - lcmp;" + |
| "95 - fcmpl;" + |
| "96 - fcmpg;" + |
| "97 - dcmpl;" + |
| "98 - dcmpg;" + |
| "99 b ifeq;" + |
| "9a b ifne;" + |
| "9b b iflt;" + |
| "9c b ifge;" + |
| "9d b ifgt;" + |
| "9e b ifle;" + |
| "9f b if_icmpeq;" + |
| "a0 b if_icmpne;" + |
| "a1 b if_icmplt;" + |
| "a2 b if_icmpge;" + |
| "a3 b if_icmpgt;" + |
| "a4 b if_icmple;" + |
| "a5 b if_acmpeq;" + |
| "a6 b if_acmpne;" + |
| "a7 b goto;" + |
| "a8 b jsr;" + |
| "a9 l ret;" + |
| "aa T tableswitch;" + |
| "ab U lookupswitch;" + |
| "ac - ireturn;" + |
| "ad - lreturn;" + |
| "ae - freturn;" + |
| "af - dreturn;" + |
| "b0 - areturn;" + |
| "b1 - return;" + |
| "b2 p:f getstatic;" + |
| "b3 p:f putstatic;" + |
| "b4 p:f getfield;" + |
| "b5 p:f putfield;" + |
| "b6 p:m invokevirtual;" + |
| "b7 p:m invokespecial;" + |
| "b8 p:m invokestatic;" + |
| "b9 I:i invokeinterface;" + |
| "bb p:c new;" + |
| "bc y newarray;" + |
| "bd p:c anewarray;" + |
| "be - arraylength;" + |
| "bf - athrow;" + |
| "c0 p:c checkcast;" + |
| "c1 p:c instanceof;" + |
| "c2 - monitorenter;" + |
| "c3 - monitorexit;" + |
| "c4 W wide;" + |
| "c5 M:c multianewarray;" + |
| "c6 b ifnull;" + |
| "c7 b ifnonnull;" + |
| "c8 c goto_w;" + |
| "c9 c jsr_w;"; |
| |
| static { |
| // Set up OPCODE_INFO and OPCODE_NAMES. |
| String s = OPCODE_DETAILS; |
| int len = s.length(); |
| |
| for (int i = 0; i < len; /*i*/) { |
| int idx = (Character.digit(s.charAt(i), 16) << 4) | |
| Character.digit(s.charAt(i + 1), 16); |
| int info; |
| switch (s.charAt(i + 3)) { |
| case '-': info = FMT_NO_ARGS; break; |
| case '0': info = FMT_NO_ARGS_LOCALS_1; break; |
| case '1': info = FMT_NO_ARGS_LOCALS_2; break; |
| case '2': info = FMT_NO_ARGS_LOCALS_3; break; |
| case '3': info = FMT_NO_ARGS_LOCALS_4; break; |
| case '4': info = FMT_NO_ARGS_LOCALS_5; break; |
| case 'b': info = FMT_BRANCH; break; |
| case 'c': info = FMT_WIDE_BRANCH; break; |
| case 'p': info = FMT_CPI; break; |
| case 'l': info = FMT_LOCAL_1; break; |
| case 'm': info = FMT_LOCAL_2; break; |
| case 'y': info = FMT_LITERAL_BYTE; break; |
| case 'I': info = FMT_INVOKEINTERFACE; break; |
| case 'L': info = FMT_LDC; break; |
| case 'S': info = FMT_SIPUSH; break; |
| case 'T': info = FMT_TABLESWITCH; break; |
| case 'U': info = FMT_LOOKUPSWITCH; break; |
| case 'M': info = FMT_MULTIANEWARRAY; break; |
| case 'W': info = FMT_WIDE; break; |
| default: info = FMT_INVALID; break; |
| } |
| |
| i += 5; |
| if (s.charAt(i - 1) == ':') { |
| inner: |
| for (;;) { |
| switch (s.charAt(i)) { |
| case 'I': info |= CPOK_Integer; break; |
| case 'F': info |= CPOK_Float; break; |
| case 'J': info |= CPOK_Long; break; |
| case 'D': info |= CPOK_Double; break; |
| case 'c': info |= CPOK_Class; break; |
| case 's': info |= CPOK_String; break; |
| case 'f': info |= CPOK_Fieldref; break; |
| case 'm': info |= CPOK_Methodref; break; |
| case 'i': info |= CPOK_InterfaceMethodref; break; |
| default: break inner; |
| } |
| i++; |
| } |
| i++; |
| } |
| |
| int endAt = s.indexOf(';', i); |
| OPCODE_INFO[idx] = info; |
| OPCODE_NAMES[idx] = s.substring(i, endAt); |
| i = endAt + 1; |
| } |
| } |
| |
| /** |
| * This class is uninstantiable. |
| */ |
| private ByteOps() { |
| // This space intentionally left blank. |
| } |
| |
| /** |
| * Gets the name of the given opcode. |
| * |
| * @param opcode {@code >= 0, <= 255;} the opcode |
| * @return {@code non-null;} its name |
| */ |
| public static String opName(int opcode) { |
| String result = OPCODE_NAMES[opcode]; |
| |
| if (result == null) { |
| result = "unused_" + Hex.u1(opcode); |
| OPCODE_NAMES[opcode] = result; |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Gets the format and allowed cp types of the given opcode. |
| * |
| * @param opcode {@code >= 0, <= 255;} the opcode |
| * @return its format and allowed cp types |
| */ |
| public static int opInfo(int opcode) { |
| return OPCODE_INFO[opcode]; |
| } |
| } |
